grub-mkrescue.in

有助于了解操作系统如何启动之过程

#! /bin/sh -e

# Make GRUB rescue image
# Copyright (C) 1999,2000,2001,2002,2003,2004,2005,2006,2007  Free Software Foundation, Inc.
#
# GRUB is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# GRUB is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with GRUB.  If not, see <http://www.gnu.org/licenses/>.

# Initialize some variables.
transform="@program_transform_name@"

prefix=@prefix@
exec_prefix=@exec_prefix@
bindir=@bindir@
libdir=@libdir@
PACKAGE_NAME=@PACKAGE_NAME@
PACKAGE_TARNAME=@PACKAGE_TARNAME@
PACKAGE_VERSION=@PACKAGE_VERSION@
target_cpu=@target_cpu@
platform=@platform@
pkglibdir=${libdir}/`echo ${PACKAGE_TARNAME}/${target_cpu}-${platform} | sed ${transform}`

grub_mkimage=${bindir}/`echo grub-mkimage | sed ${transform}`

# Usage: usage
# Print the usage.
usage () {
    cat <<EOF
Usage: grub-mkrescue [OPTION] output_image
Make GRUB rescue image.

  -h, --help              print this message and exit
  -v, --version           print the version information and exit
  --modules=MODULES       pre-load specified modules MODULES
  --overlay=DIR           overlay directory DIR in the memdisk image
  --pkglibdir=DIR         use images from directory DIR instead of ${pkglibdir}
  --grub-mkimage=FILE     use FILE as grub-mkimage
  --image-type=TYPE       select floppy or cdrom (default)

grub-mkimage generates a bootable rescue image of the specified type.

Report bugs to <[e-mail]>.
EOF
}

image_type=cdrom
input_dir=${pkglibdir}
grub_mkimage=grub-mkimage

# Check the arguments.
for option in "$@"; do
    case "$option" in
    -h | --help)
	usage
	exit 0 ;;
    -v | --version)
	echo "grub-install (GNU GRUB ${PACKAGE_VERSION})"
	exit 0 ;;
    --modules=*)
	modules=`echo "$option" | sed 's/--modules=//'` ;;
    --overlay=*)
	overlay=`echo "$option" | sed 's/--overlay=//'` ;;
    --pkglibdir=*)
	input_dir=`echo "$option" | sed 's/--pkglibdir=//'` ;;
    --grub-mkimage=*)
	grub_mkimage=`echo "$option" | sed 's/--grub-mkimage=//'` ;;
    --image-type=*)
    	image_type=`echo "$option" | sed 's/--image-type=//'`
        case "$image_type" in
          floppy|cdrom) ;;
          *)
            echo "Unknown image type \`$image_type'" 1>&2
            exit 1 ;;
        esac ;;
    -*)
	echo "Unrecognized option \`$option'" 1>&2
	usage
	exit 1
	;;
    *)
	if test "x$output_image" != x; then
	    echo "Unrecognized option \`$option'" 1>&2
	    usage
	    exit 1
	fi
	output_image="${option}" ;;
    esac
done

if test "x$output_image" = x; then
  usage
  exit 1
fi

if [ "x${image_type}" = "xfloppy" ] ; then
  floppy_image=${output_image}
else
  floppy_image=`mktemp`
fi

memdisk_dir=`mktemp -d`
mkdir -p ${memdisk_dir}/boot/grub
cp ${input_dir}/*.mod \
  ${input_dir}/command.lst ${input_dir}/moddep.lst ${input_dir}/fs.lst \
  ${memdisk_dir}/boot/grub/

if test "x$overlay" = x ; then : ; else
  cp -dpR ${overlay}/* ${memdisk_dir}/
fi

memdisk_img=`mktemp`
tar -C ${memdisk_dir} -cf ${memdisk_img} boot
rm -rf ${memdisk_dir}

core_img=`mktemp`
${grub_mkimage} -d ${input_dir}/ -m ${memdisk_img} -o ${core_img} memdisk cpio biosdisk ${modules}
rm -f ${memdisk_img}
cat ${input_dir}/boot.img ${core_img} /dev/zero | dd bs=1024 count=1440 > $floppy_image
rm -f ${core_img}

if [ "x${image_type}" = "xfloppy" ] ; then
  exit 0
fi

iso_dir=`mktemp -d`
cp $floppy_image ${iso_dir}/floppy.img
genisoimage -b floppy.img -o ${output_image} -r ${iso_dir}
rm -rf ${iso_dir}

rm -f ${floppy_image}

exit 0